Does your 2/3 recognize colors yet?
Nadia turned 3 at the end of March. She knows all her colors (the common ones, anyway, but not colors like lavender or teal). It took her a while to learn them and she used to regularly confuse red and green. So much so that I found a simple colorblindness test online and found that she could see the difference, but she just mixed up the names. We just pointed out colors and used them in our everyday talk (look at that blue car, etc.). They also work on them at daycare, so that helped, too.